The set representing the right order of ionic radius is

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${Mg}^{2 +} > {Be}^{2 +} > {Li}^{+} > {Na}^{+}$

${Na}^{+} > {Mg}^{2 +} > {Li}^{+} > {Be}^{2 +}$

${Li}^{+} > {Na}^{+} > {Mg}^{2 +} > {Be}^{2 +}$

${Na}^{+} > {Li}^{+} > {Mg}^{2 +} > {Be}^{2 +}$

answer is D.

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Detailed Solution

To find the set representing the right order of ionic radius from the given options.

Formula/Concept to be used:

Atomic radius

Detailed Solution:

The sodium ion has a larger size than lithium because it has one extra shell than lithium and consequently its size will be greater than lithium.

Now, lithium has a larger size than magnesium because the charge on an ion lesser will be its size. Also, Mg has a larger size than beryllium because of the presence of an extra shell compared to beryllium. Or we can say, the more the charge on an ion lesser will be its size due to the increase in effective nuclear charge after the loss of electrons.

The effective nuclear charge will be greater in the ion which has to lose more electrons.

Therefore, Option D is the correct answer.

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